Photochromism of Spiropyran

Spiropyran (colorless) → Merocyanine (colored)

개요

UV light causes the C–O bond in spiropyran to break, opening the ring to form the planar, conjugated merocyanine isomer that absorbs visible light and appears colored. Visible light or heat reverses the reaction. This reversible photochromism is the basis for smart materials that change color in response to light.

일상 속 예시

Photochromic sunglasses (Transitions lenses) that darken in sunlight use similar photochromic molecules that reversibly change structure.

산업적 중요성

광변색 재료는 자가 착색 안경, 스마트 창, 광학 데이터 저장, 나노기술용 분자 스위치에 사용됩니다.

성질

유형
Photochemical
가역 반응
예
에너지
흡열

관련 반응

Photochemical Smog Formation (NO₂ Photolysis) Chlorophyll Fluorescence Photodegradation of Methylene Blue by TiO₂ Photodissociation of Chlorine Gas Silver Bromide Photodecomposition Cis-Trans Isomerization of Retinal Photosynthesis Ozone Formation by UV Light Silver Chloride Photodecomposition Dye-Sensitized Solar Cell (Grätzel Cell)

Frequently Asked Questions

What is the equation for Photochromism of Spiropyran?
The balanced equation is: Spiropyran (colorless) → Merocyanine (colored).
What type of reaction is Photochromism of Spiropyran?
Photochromism of Spiropyran is a photochemical reaction. It is reversible under certain conditions.
Is Photochromism of Spiropyran exothermic or endothermic?
Photochromism of Spiropyran is endothermic (absorbs energy).